Not getting clear print , parts of lines faint or missed, hard to read copies, seems to be bottom half of line,every 4th line

Ink low, dodgy ink, or head is wearing, blocked and cant get enough ink to paper, try with manufactures ink, but more than likly the head is block no easy fix, normally a write off, once in a blue moon after much effort one can clean the print head, total sttrip down and windex or metho the print head once removed but be prepaired to work on it for 1/2 a day, get covered in ink, with a good chance of getting nowhere...I'd try fresh ink then I'd quote you more than its cost..labour intesive..sorry